How does the rate of exchange work with people paying outside of the United States?

On Instantgo, you always get paid on the currency set on your account. To set your currency, simply go to your profile, click on edit profile and choose your currency in the "price indication" tab.

Whenever you get paid for a service you provide, you will always get paid the amount you have set in your rates settings. You don't take a foreign currency risk on the current exchange rate as the user will have to pay you for the amount you presented and requested to them.